Via Twitter, Nintendo president Satoru Iwata has said, "When you use two, the framerate halves to 30 frames per second."

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So that means all those 60fps Wii U games Nintendo has been banging on about slow to 30fps if you fire up a second Wii U GamePad.

Over time, I'd imagine this is something Nintendo will rectify. Which is probably why Iwata added, "At launch, we'll start by offering games that use only one [Wii U GamePad] and then expand from there."